Browse Prior Art Database

Automatic Silicon Function Disable

IP.com Disclosure Number: IPCOM000126996D
Publication Date: 2005-Aug-16
Document File: 4 page(s) / 52K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for disabling functional system blocks within an IC design when cutting or removing a set of pins on a package. Benefits include automatically removing features without fuses.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Automatic Silicon Function Disable

Disclosed is a method for disabling functional system blocks within an IC design when cutting or removing a set of pins on a package. Benefits include automatically removing features without fuses.

Background

Currently, multiple markets benefit from removing select functionality from a design by using silicon modifications or by assigning pins as “no connect” (see Figure 1). Removing select functionality blocks access to certain operations; however, the circuits still consume power.

General Description

The disclosed method disables functional system blocks within an IC design when cutting or removing a set of pins on a package. When the I/O and power is limited to a specific function, the chip circuitry is still active. By creating separate N-wells as lines of demarcation for the function and adding several large value resistors to the ground, the effected functions may be powered down once the I/O and power pins are disconnected. Also, a logic signal is derived and fed back into the logic core to indicate that the function has been disabled. 

Figure 2 shows which circuit lines are cut by a package modification. Figure 3 shows the additional poly resistors needed to ground (i.e. power down) the logic and signal the other running functions.

Advantages

The disclosed method automatically removes features without using fuses.

Disclosed anonymously